package com.learn.rabbitmq.eight.maxlength;

import com.learn.rabbitmq.utils.RabbitMqUtils;
import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

/**
 * 死信队列  队列达到最大长度
 * <p>
 * 消费者1
 */
public class Consumer01Length {
    //普通交换机
    public static final String NORMAL_EXCHANGE = "normal_exchange";
    //死信交换机
    public static final String DEAD_EXCHANGE = "dead_exchange";
    //普通队列
    public static final String NORMAL_QUEUE = "normal_queue";
    //死信队列
    public static final String DEAD_QUEUE = "dead_queue";

    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMqUtils.getChannel();
        //声明死信和普通交换机
        channel.exchangeDeclare(NORMAL_EXCHANGE, BuiltinExchangeType.DIRECT);
        channel.exchangeDeclare(DEAD_EXCHANGE, BuiltinExchangeType.DIRECT);
        //-------------------------begin----------------------
        //声明普通队列
        Map<String, Object> arguments=new HashMap<>();
        //过期时间(毫秒)   可以生产者发送设置 也可以 消费者设置
        //arguments.put("x-message-ttl",10000);
        //正常队列设置死信交换机
        arguments.put("x-dead-letter-exchange",DEAD_EXCHANGE);
        //设置死信交换机的routingKey lisi
        arguments.put("x-dead-letter-routing-key","lisi");
        //设置正常队列长度限制 活6死4
        arguments.put("x-max-length",6);
        channel.queueDeclare(NORMAL_QUEUE,false,false, false,
                arguments);

        //-----------------------------end-------------------
        //声明死信队列
        channel.queueDeclare(DEAD_QUEUE,false,false, false,null);
        //绑定交换机与队列
        channel.queueBind(NORMAL_QUEUE,NORMAL_EXCHANGE,"zhangsan");
        channel.queueBind(DEAD_QUEUE,DEAD_EXCHANGE,"lisi");
        System.out.println("C1等待接收消息。。。");


        channel.basicConsume(
                NORMAL_QUEUE,
                true,
                (consumerTag, message) -> {
                    System.out.println("C1接收的消息是:"+new String(message.getBody(), StandardCharsets.UTF_8));
                },
                consumerTag -> {

                });
    }
}
